Volume 10, Issue 1 (March 1988)

    Water Absorption of Resins and Composites: IV. Water Transport in Fiber Reinforced Plastics

    CODEN: CTROAD

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    Abstract

    An analysis of diffusivity of composites is described in which an electrical resistance analogy is used. This leads to an expression for diffusivity, which takes into account the contributions of fiber diffusivity, matrix diffusivity, and the diffusivity of the interphase, when this is different from that of the polymer matrix. The case involving the interphase requires numerical integration for its solution. However, the effect of the interphase can be very accurately simulated in a more approximate model; a closed form expression for composite diffusivity is obtained that agrees with the numerical analysis within better than 1% if an appropriate adjustment for interphase width is made. The same approach was used for including voids in the analysis, and it is shown that, in some experiments described previously with glass and carbon fiber pultrusions, the results can be explained on the basis of the voids in the composite providing an enhanced diffusion path for water. This “void path” apparently has a diffusivity of 15 times that of the polymer. Since the results obtained using the interphase diffusion model do not agree so well with the experimental data as does the void path model, it is concluded that, at least for carbon-epoxy and glass-epoxy pultrusions, the most important conducting path for water is provided by the voids.


    Author Information:

    Piggott, MR
    Professor, University of Toronto, Ontario

    Woo, M
    Materials science engineer, Digital Equipment Canada Ltd., Kanata, Ontario


    Stock #: CTR10271J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10271J

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    Author
    Title Water Absorption of Resins and Composites: IV. Water Transport in Fiber Reinforced Plastics
    Symposium , 0000-00-00
    Committee D30